provincialism

noun

1. (countable, uncountable)The quality of being provincial; having provincial tastes, mentality, manners.

   “The blacksmith's provincialism showed in his speech and manner”

2. (countable, uncountable)A word or locution characteristic of a region or district.

   “Prose is allowed less liberty in this respect; but no one nowadays would maintain that the adoption of a provincialism into the literary dialect is absolutely prohibited.”

3. (countable, uncountable)Synonym of regionalism: belief in the superiority of one's regional government; the belief that most or nearly all political power should be decentralized to provincial governments.